[TxMt] Enhancement of Math commands: overwrite previous results

[Timothy Bates]

Hi all,
1. Currently, if you have some numeric data and do a math evaluation, for
instance

  60 + 220  = 280

If you do a new evaluation on that line, the result is
  60 + 220  = 280 standard_in) 1: parse error
 
SUGGESTION to the math maintainer: Might you alter the code to delete the
contents of the line or selection subsequent to an "=" character, before
evaluating?



2. The currency math commands, would it make sense to use the detected
prefix?

i.e., currently "$20 + $40" evaluates to "$20 + $40 = 60"

Perhaps it should evaluate to "$20 + $40 = $60"

Cheers,
Tim

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